Peter John Cain (born 10 November 1954) is an Australian politician, elected to the seat of Ginninderra in Australian Capital Territory Legislative Assembly on 17 October 2020, representing the Canberra Liberals.
He graduated from the University of Newcastle with a bachelor's degree in Mathematics (Hons), and a Diploma of Education.
Cain's early career was in teaching in NSW, South Australia and the ACT.
Cain was appointed the following shadow portfolios; Attorney-General, Planning and Land Management, Multicultural Affairs and Assistant Treasurer.
Cain's former portfolios were Regulatory Services and Jobs and Workplace Affairs, that were redistributed to other Liberal MLAs in the mid-2022 reshuffle.